Develop a personalized conditional rendering directive in Vue.js

I am exploring how to create a custom Vue conditional directive. While I could simply use a global method and call it within a v-if, I prefer the idea of having a dedicated directive for clarity in my code.

My objective is to apply this directive to an element and provide a Guid to it (for managing conditional rendering based on user permissions):

v-permission="'4ECE1FD4-4019-4CA2-AB9E-0A555CCBDB5B'"

Currently, I am using the directive's bind method to add display: none to the element, which successfully hides the content. However, for better performance, I would like to avoid rendering the element altogether.

Does anyone have any suggestions on how I can accomplish this?

Here is the snippet of the current directive code:

import Vue from 'vue'

Vue.directive('permission', {
  bind: function (el, binding, vnode) {
    if (binding.value) {
      let hasPermission = 
vnode.context.$store.getters.hasApiPermission(binding.value)
      if (!hasPermission) {
        el.style.display = 'none'
      }
    } else {
      console.error('You must specify a permission ID')
    }
  }
})

Answer №1

One way to achieve this is by utilizing the inserted hook:

inserted: triggered when the element is inserted into its parent node.

Here’s an example snippet of code showcasing how it works:

Vue.directive('permission', {
  inserted: function (el, binding, vnode) {
    if (binding.value) {
      let hasPermission = 
vnode.context.$store.getters.hasApiPermission(binding.value)
      if (!hasPermission) {
        el.parentNode.removeChild(el)
      }
    } else {
      console.error('Please provide a permission ID')
    }
  }
})

Nevertheless, it is recommended to leverage the built-in v-if directive for a more efficient solution. With Vue 2 operating on virtual DOM, it will not render if the condition evaluates to false. On the other hand, using a custom directive like in this case may result in initial rendering followed by removal.

Answer №2

It's uncertain whether achieving what you desire is feasible. However, it's also unclear if it's truly necessary. In my opinion, a structure like this,...

<tag v-if="getPerm('4ECE1FD4-4019-4CA2-AB9E-0A555CCBDB5B')">
  ...
</tag>

...is sufficiently declarative.

Similar questions

If you have not found the answer to your question or you are interested in this topic, then look at other similar questions below or use the search

How to create a loop in Selenium IDE for selecting specific values from a drop-down list?

Is there a way to use Selenium IDE and JavaScript to test a drop-down box with specific items, not all of them, and continuously loop through until the entire list is covered? Any tips or recommendations on how to accomplish this? ...

What language should be used for JSON data formats?

I am dealing with a JSON file named myjson.cfg that has the following structure: { "values": { "a": 1, "b": 2, "c": 3, "d": 4 }, "sales": [ { "a": 0, "b": 0, "c": 0, "d": 0, ...

How can I achieve a similar functionality to array_unique() using jQuery?

When I select values from a dropdown, they are stored as an array like ["1","2","3"] Upon each change, the code below is executed to generate a new array based on the selected values: $('#event-courses-type').on('change', function(){ ...

Using getJSON to return key/value pair from local host URL in JSFiddle - A step-by-step guide

After following a tutorial on building an API using Python, Flask, SQLite, and SQLAlchemy, I have successfully tested the connection by hitting the localhost address in my browser. Now, I am curious if it is possible to test this connection and see the des ...

Loop through an array of elements in JavaScript and retrieve the element with the largest pixel size

I am facing a challenge with elements positioned absolutely on a web page. My goal is to iterate over these elements and identify the one with the highest top value. I attempted two different approaches: const elems = document.querySelectorAll('.ind ...

What is the best way to manage classNames dynamically in React with Material-UI?

I am wondering how to dynamically add and remove classes from an img tag. My goal is to change the image automatically every 2 seconds, similar to Instagram's signup page. I am struggling to achieve this using the material-ui approach. Below is a snip ...

Tips for styling links in Nuxt/Vue based on specific conditions

Struggling with conditional styling in my Nuxt app. I want to change the background color of the active link based on the current page. Using .nuxt-link-exact-active works for styling the active link, but how can I customize it for each page? The links ar ...

Deciphering the hidden power of anonymous functions within Express.js

Recently, I started learning about express and am grappling with understanding callbacks in RESTful actions. In the following PUT request code snippet, I am puzzled by the specific line that is highlighted below. Why is response.pageInfo.book being assigne ...

Can all anchor tags properties on a website be simultaneously changed?

Recently, I discovered that using target="_blank" in anchor tags can leave a website vulnerable to security risks, and the recommended alternative is to use rel="noopener". In my current web project, all anchor tags are currently utilizing the target attri ...

Utilizing a dropdown list in HTML to dynamically change images

On my HTML page, I have implemented a dropdown list box. My objective is to change an image and update a label based on the selection made from the dropdown list box. I already have an array called 'temp' which represents the number of items. The ...

Exploring Best Practices for Coding in node.js

Method 1: Constructor and Prototype Objects function Database(url) { this.url = url; } Database.prototype.info = function (callback) { http.get(this.url + '/info', callback); }; Method 2: Closures Approach function Database(url) { ...

Sending JSON Data with Javascript Post Request

I've been attempting to send a JSON payload via a JavaScript script, but my webhooks don't seem to recognize the payload no matter what I try. Here is the code that I compiled from various online resources: let xhr = new XMLHttpRequest(); ...

Running Python in React using the latest versions of Pyodide results in a malfunction

As someone who is new to React and Pyodide, I am exploring ways to incorporate OpenCV functionality into my code. Currently, I have a working piece of code that allows me to use numpy for calculations. However, Pyodide v0.18.1 does not support OpenCV. Fort ...

Using Vue.js to increment a value in an array every time a new row is added

In Vue.js, I am attempting to increment an array value when adding a new row. However, I encounter the following error message: You may have an infinite update loop in a component render function. The JavaScript logic looks like this: new Vue({ el: ...

Having trouble accessing the data I'm setting in a separate component using the Context API

Currently working on my own project and I've encountered a problem while using the Context API. It's my first time using it. The issue I'm facing is that I can't seem to console.log the data I'm setting. I'm trying to create ...

Displaying complex JSON data in an HTML format using JavaScript

How can I convert the second array of entities into an HTML format from the JSON data using a for loop or similar method? To access the necessary data, I currently use console.log(data.response[0].entities.urls); $(document).ready(function () { $.getJSO ...

Is submitting with JQuery always a hit or miss?

Hey there, I'm currently working on a problem and could use some help. I seem to be having trouble getting inside my function for form submission in JQuery. Despite setting up console.logs, it appears that my code never reaches the first function. Can ...

What does the underscore before a function in JavaScript or PHP signify?

I am curious about the significance of the underscore symbol (_) when it is placed before a function or variable. Does it serve to simply describe something, or is it required for executing specific functions or calling certain methods? In JavaScript: va ...

Exploring the seamless integration of the Material UI Link component alongside the Next.JS Link Component

Currently, I am integrating Material-UI with Next.js and would like to leverage the Material-UI Link component for its variant and other Material UI related API props. However, I also require the functionality of the Next.js Link component for navigating b ...

Exploring the concept of union types and typeguards in TypeScript

I'm struggling with this code snippet: function test(): any[] | string { return [1,2] } let obj: any[] = test(); When I try to run it in vscode, I get the following error message: [ts] Type 'string | any[]' is not assignable to type & ...